Stop-watch.



No. 678,382. Patented July [6, I901.

' E. DUPUIS.

STOP WATCH.

(Application filed Aug. '6, 1898.)

'(No Model.)

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ilrursn STATES ATENTMLFFIQEO EUGENE DUPUIS, OF NEW YORK, N. Y.

STO P=WATC H.

SPECIFICATION forming part of Letters latent No. 678,382, dated July 16, 1901, Application filed August 6, 1898. Serial No. 687,937. (No model.)

To all whom it may concern:

Be it known that I, EUGENE DUP'UIS, a citi zen of Switzerland, and a resident of the city of NewYork, in the county of New York and State of New York, have invented certain new and useful Improvements in Split-Seconds Mechanism for Stop-Watches, of which the following is a specification.

This invention relates to improvements in stop-watches, and especially to that class of stop-watches provided with a split-seconds attachment. Heretofore watches of this kind have been provided with a hollow arbor for the wheel, known as the chronographwheel, and thisarbor carries a heart-cam for a spring-lever for throwing it back to the initial position, and also carries an additional heart-cam on which a spring-lever rests which is pivoted to the brake-wheel on a very fine shaft or arbor passing through the abovementioned hollow arbor and carrying the split-secondshand. Thisbrake-wheelisvery small, and the spring-lever on the same and the spring acting on the lever are of extremely minute dimensions, are very expensive, are very apt to be broken in handling-and in repairing the watch or taking it apart for repairing it, and, furthermore, the parts when constructed as described above are very eX- pensive and not always reliable, as they are so minute.

The object of my invention is to provide a' new and improved split-seconds attachment which is strong and durable, is not apt to get out of order or to break, is very simple in construction and not expensive, andacts quickly and reliably.

In the accompanying drawings, forming a part of this specification, and in which like letters of reference indicate like parts in all the views, Figure l is a plan view of my improved split seconds attachment for stepwatches viewed from the side opposite the dial. Fig. 2 is a vertical sectional view of the same on the line 2 2 of Fig. 1.

The toothed wheel A, known as the chronograph-wheel, is fixed on the tubular arbor B in the well -known manner and can be thrown into and out of engagement with the toothed wheel 0, part of which is shown, in any well-known manner.

The heart-cam D for the wheel A is fixed upon the arbor B and can be acted upon by the spring-lever E in any well-known manner for the purpose of throwing the wheel A into the initial position.

The arbor B carries the fly-back secondshand F, and the split-seconds hand G is fixed on an arbor H, passing loosely through the tubular arbor B, and carrying at its inner end-that is, on the end opposite the one carrying the split-seconds hand G- the' brake- Wheel J, which has its rim serrated or roughened, which rim is to be gripped by the well-known brake-levers K, shown in dotted lines, when the split-seconds hand G is to be stopped.

Adjacent to the wheel A, a small heart-cam L is fixed on the inner arbor H, and on its edge a lever M rests, which is pivoted to the Wheel A and is actedupon by a spring 0, also attached to the wheel A.

When the wheel A is started and the brakelevers K are disengaged from the wheel J, the arbor H is carried around with the wheel A by the action of the spring-lever M on the heart-eam L, as the end of said lever rests in the recess in the edge of the heart-cam L and the two hands F and G make their fractionalseconds beats together.

When the split-seconds hand G is stopped by applying the brake-levers K on the rim of the brake-wheel J, the heart-cam L is also stopped and the end of the lever M is drawn out of the notch in said heart-cam L and slowly travels on the edge of the heart-cam as the wheel A continues to rotate.-

WVhen the wheel A is stopped and the brakelevers K are disengaged from the brake-wheel J, the spring-lever M throws the heart-cam L, and with it the inner arbor H and split-see onds hands G, into the initial position -that is, parallel with the secondshand F-and then when the wheel A is thrown into its initial position both hands F and G are thrown into the initial position in the well-known manner.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is--- In a split-seconds watch, the combination with a seconds-wheel and a tubular arbor on the same, of a split-seconds arbor passed seconds-hand, substantially as herein shown and described.

In testimony that I claim the foregoing as my invention 1 have signed my name, in pres- I 5 ence of two Witnesses, this 26th day of July, 1898.

EUGENE DUPUIS.

\Vitnesses:

H. M. FLANNERY, OSCAR F. GUNZ. 

